Bluethoot 5.0 really slow when transfering files to/from Boox Tab Ultra C Pro and Macbook Pro 2021

Dear support,

according to Bluetooth 5.0 specifications, which are both supported by the Tab Ultra C Proc and the Macbook Pro 2021 (Apple M1 Pro Chip, Sonoma 14.5 OS) that I am using, a transfer speed of up to 2 Mbps should be supported. 

However, I am experiencing transfer speeds below 120 kB/s (960 kbps), even when the devices are next to each other. 

Have you measure the transfer speed between devices? Is there something wrong that can be optimized here?